Device for putting toroidal ferrite core on wire

ABSTRACT

A device for putting toroidal ferrite cores on a wire, in which the end of the wire is made at least as a half-turn of a spiral and is lowered into a magazine containing ferrite cores charged therein in bulk and constituting a layer. The magazine is rotated in the direction opposite to that of the winding of the spiral, with the device being provided with a fixing means for preventing the spiral from turning about the base of the device. This fact provides an automatic process of putting ferrite cores of any size on a wire of any diameter.

llnited States Patent [191 Seleznev et al.

[451 Feb. 112, 1974 3,551,986 l/l971 Lima et al 29/203 MM PrimaryExaminerThomas H. Eager Attorney, Agent, or FirmHolman & Stern 5 7]ABSTRACT A device for putting toroidal ferrite cores on a wire, in whichthe end of the wire is made at least as a halftum of a spiral and islowered into a magazine containing ferrite cores charged therein in bulkand constituting a layer. The magazine is rotated in the directionopposite to that of the winding of the spiral, with the device beingprovided with a fixing means for preventing the spiral from turningabout the base of the device. This fact provides an automatic process ofputting ferrite cores of any size on a wire of any diameter.

5 Claims, 3 Drawing Figures DEVICE FOR PUTTING TOROIDAL FERRITE CORE NWIRE BACKGROUND AND SUMMARY OF THE INVENTION The present inventionrelates to processes of making ferrite-core memory cubes for electroniccomputers and, more particularly, the invention relates to devices forputting toroidal ferrite cores on a wire.

This invention can be used for putting ferrite core of any size,including super-miniature cores featuring properties of dust particles,on sections of wires or on a wire of unlimited length made of anymaterial and having any cross. section, including microwires. The

operation of putting ferrite cores on a wire is the first stage in atechnological process of making ferrite-core memory matrixes and cubesfor electronic computers. The wire with a ferrite core installed is usedfor further operations both in hand interweaving of ferrite matrixes andin mechanical and automatic threading by means of devices which havebeen recently developed.

Known in the art are devices for puttingtoroidal ferrite cores on awire. These devices comprise a vibrobunker for feeding the, cores to theworking zone, a permanent magnet made in the form of a ring mounted on arotary drum, and'a hollow needle containing awire threaded therein, theneedle being fixed to the end face of a hollow conical insert secured ina holder. Disposed on the end face; of the insert around the needle arethrough passages, while the inner channel of theinsert is connected to avacuum pump.

This prior art devicev is complexin'manufacture and,

particularly, in adjustment. The, vibratory components of the device arequite unreliable inoperationand must frequently be. readjusted as anychange; in the stiffness of the material or the magnitudes of theangiesof the connecting rods; between the vibrator and the bunker, as well asany weakening of the fastenings, result in the failure of the device tooperate due to the loss in the direction of vibration. The constructionof the receiving portion of the device with a hollow needle and theconical insert as well with a ring of a magnetic. material mounted on arotary. drum is rather complicated and the whole assembly is unreliablein operation due'to the presence of a vacuum pump and self-containeddrives of the pump and drum. Another disadvantage, of the known deviceis that the vibratory device is useless for putting-on tiny ferritecores having an outer diameter of 0.6 mm or less where low weight andlarge sailrarea giveto the cores properties of dust particles.

The low efficiency of the known device results in the general use of amanual procedure for putting ferrite cores on a wire.

The hand operation of puttingferrite cores on a wire involves aprocessin which a wire, the end of whichis heat-treated or plated or isequipped with a steel needle brazed thereon, is shaped as a sabre and isperiodically inserted by hand into a layer of ferrite cores charged intoa bunker or other vessel for puttingthese cores on the wire.

The-disadvantages of the manual operation of putting ferrite cores on awire include monotony, intricacy and low efficency.

An object of the present invention is to eliminate the above-mentioneddisadvantages.

A special object of the invention is to provide a device for puttingtoroidal ferrite cores on a wire which will be simple and convenient inoperation and which will ensure an automatic process of puttingminiature ferrite cores on a wire.

This object is attained by providing a device for putting toroidalferrite cores on a wire in which a magazine charged with ferrite coresis forced into motion in such a manner that the cores move about thewire and are thus placed on this wire. According to the invention, thewire end lowered into the layer of ferrite cores in the magazine is madein the form of at least a half-tum of a spiral, while the magazine isrotated in the direction opposite to that of the coiling of the spiral,with the device being equipped with a fixing means for retaining thespiral against rotation relative to the base of the device.

The fixing means may be made in the form of a guide trough arrangedabove the magazine, the wire for putting-on the cores passing within thetrough.

The bottom of the magazine may be provided with an opening for mountinga sleeve through which a wire used for putting-on the cores is passed,the upper face of the sleeve being located above the layer of corescharged into the magazine.

The fixing means is preferably made in the form of a strap disposedinside the magazine below the sleeve and intersecting the axis ofrotation of the magazine or in the form of a fixed plate disposed insidethe magazine eccentrically relative to the sleeve opening.

Such a device allows the process of putting ferrite cores on a wire tobe effected automatically regardless of the size of the cores and thediameter of the wire. The proposed device can also be used for rejectionof ferrite cores having no central hole.

BRIEF DESCRIPTION OF THE DRAWINGS The invention will be betterunderstood from the following detailed description of some embodimentsof the invention, reference being made to the accompanying drawings, inwhich: 1

FIG. 1 is a diagrammatic view of the device for putting toroidal ferritecores on a wire, according to the invention;

FIG. 2 is a modification of the device of FIG. 1 with an opening in themagazine bottom, according to the invention; and

FIG. 3 is a modification of the device of FIG. 1 with a fixing means inthe form" of a plate disposed inside the magazine, according to theinvention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS The device for putting toroidalferrite cores on a wire comprises a base 1 (FIG. 1) on which is arrangeda magazine 2 made in the form of cylindrical cup with an open upperportion. Ferrite cores 3 are charged into the cup 2 from above.

Lowered into the layer of cores 3 is an end of a wire 4 intended forputting thereon the ferrite cores 3. The end of the wire 4 immersed intothe layer of ferrite cores is made in the form of a complete or partialturn of a spiral. The magazine 2 is rotated by a drive 5 in thedirection opposite to the direction of winding of the spiral turn. Thedevice is equipped with a fixing means 6 serving to keep the wire 4 in adefinite position relative to the magazine 2 for preventing rotation ofthe spiral about the base 1.

The fixing means 6 may be made in the form of a guide trough 7 or as atube disposed above the magazine 2 and secured to the base 1. The wire 4for puttingon the cores is placed inside the trough 7, the innerdiameter of which must somewhat exceed the outer diameter of the cores 3so as to provide for their unobstructed motion along the wire 4.

The magazine 2 (FIG. 2) may have an opening 8 in its bottom in which ismounted a sleeve 9 through which is passed the wire 4. The upper face ofthe sleeve 9 is located inside the magazine 2 above the layer of cores 3charged into the magazine.

In one embodiment of the invention the fixing means 6 is made in theform of a strap 10 located below the sleeve 9 and intersecting the axisof rotation of the magazine 2. In this case the wire 4 leaving thesleeve 9 is somewhat bent in accordance with the shape of the fixingstrap 10.

In another embodiment of the invention (FIG. 3) the fixing means of thedevice is made in the form of a plate 11 placed within the magazine 2and rigidly secured on the base 1 of the device with the aid of a screw12. The plate 11 is disposed above the sleeve 9 with a small gap withsome eccentricity relative to the axis of rotation of the magazine 2 sothat it does not close the opening of the sleeve 9. i

The cores 3 put on the wire in the form of columns 13 are transferredalong the continuation of the wire 4 beyond the device for practicallyan unlimited length.

The principle of operation of the device for putting toroidal ferritecores on a wire is as follows:

Before starting the operating cycle, the magazine 2 (FIG. 1) is chargedwith ferrite cores 3, in which case the wire 4 to be used as a threaderof the cores 3 is passed through the fixing means 6 and its end iscoiled and lowered into the layer of cores 3.

Then the drive is switched on and the magazine 2 is rotated in thedirection opposite to the direction of winding of the coil.Simultaneously with the rotation of the magazine 2, the cores 3 areforced to rotate in the same direction. Since the end of the wire 4 iscoiled into a spiral and is directed against the rotation of the layerof ferrite cores 3, a portion of these cores 3 is put on the wire 4 as acolumn 13 due to the interaction with the cores 3 moving together withthe magazine 2 and is moved upwards clearing a space at the end of thespiral forputting the next cores 3 on the wire. The column 13 of cores 3moves up along the wire 4 to the fixing means 6, passes therethrough andmoves down along the descending branch of the wire.

If the fixing means is made in the form of a tube or a trough 7 disposedabove the magazine 2, the wire4 is passed through this tube or trough.

If the fixing means 6 is made in the form of a strap (FIG. 2), the wire4 is passed through the sleeve 9,

then the end of the wire 4 is coiled into a spiral. During the operationof the device the columns 13 of cores 3 descend along the wire 4enveloping the strap 10 which does not allow the wire 4 to rotate aboutthe axis of rotation of the magazine 2.

If the fixing means 6 is made in the form of a plate 11, the wire 4 ispassed through the sleeve 9, then the end of the wire is coiled into aspiral. During the operation of the device the columns 13 of cores 3descend through the sleeve 9 along the straight portion of the wire 4,in which case the plate 11 prevents the wire 4 from turning about theaxis of rotation of the magazine 2.

In all cases of using the fixing means 6, the wire 4 during theoperation of the device is subject to some vibration due to theinteraction with the cores 3 occupying the magazine 2 and this fact, inturn, facilitates the movement of the columns 13 of cores 3 through thefixing means 6.

The proposed device provides for an automatic process of puttingtoroidal ferrite cores of any size on a wire of any diameter. The deviceis simple to manufacture and is reliable in operation.

What is claimed is as follows:

1. A device for putting toroidal ferrite cores on a wire comprising incombination: a base; a magazine disposed on said base and charged withferrite cores constituting a layer; a wire for putting-on the coreshaving one end lowered into said magazine and being made in the form ofat least a half-tum of a spiral; a drive rotating said magazine in thedirection opposite to the direction of winding of the spiral and, at thesame time, rotating the layer of ferrite cores charged into the magazineso that the cores move relative to the end of the wire and are put onthis wire; and a fixing means secured on said base, interacting withsaid wire and preventing rotation of said end of said wire relative tosaid base.

2. A device as claimed in claim 1, in which the fixing means is made inthe form of a guide trough disposed above said magazine, the wire forputting-on the cores passing within said trough.

3. A device as claimed in claim 1, in which said magazine has an openingin its bottom while the device itself includes a sleeve mounted in saidopening so that its upper face is always above the layer of corescharged into said magazine; the wire for putting-on said cores being ispassed through said opening.

4. A device as claimed in claim 3, in which said fixing means is made inthe form of a strap disposed below said sleeve and intersecting the axisof rotation of said magazine.

5. A device as claimed in claim 3, in which said fixing means is made inthe form of a fixed plate disposed within said magazine eccentricallyrelative to the opening of said sleeve.

1. A device for putting toroidal ferrite cores on a wire comprising incombination: a base; a magazine disposed on said base and charged withferrite cores constituting a layer; a wire for putting-on the coreshaving one end lowered into said magazine and being made in the form ofat least a half-turn of a spiral; a drive rotating said magazine in thedirection opposite to the direction of winding of the spiral and, at thesame time, rotating the layer of ferrite cores charged into the Magazineso that the cores move relative to the end of the wire and are put onthis wire; and a fixing means secured on said base, interacting withsaid wire and preventing rotation of said end of said wire relative tosaid base.
 2. A device as claimed in claim 1, in which the fixing meansis made in the form of a guide trough disposed above said magazine, thewire for putting-on the cores passing within said trough.
 3. A device asclaimed in claim 1, in which said magazine has an opening in its bottomwhile the device itself includes a sleeve mounted in said opening sothat its upper face is always above the layer of cores charged into saidmagazine; the wire for putting-on said cores being is passed throughsaid opening.
 4. A device as claimed in claim 3, in which said fixingmeans is made in the form of a strap disposed below said sleeve andintersecting the axis of rotation of said magazine.
 5. A device asclaimed in claim 3, in which said fixing means is made in the form of afixed plate disposed within said magazine eccentrically relative to theopening of said sleeve.